A domain alias is an alternative domain name for an existing site. To set one up, go to 'Websites & Domains', click on 'Add Domain Alias', enter the alias name, and select the domain to which it should point. Click 'OK' to set up the alias.
Domain aliases allow you to point several domain names to the same website. This can be useful, for example, for branding purposes.
To set up a domain alias in Plesk:
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Go to Websites & Domains and run the Add Domain Alias wizard.
https://docs.plesk.com/en-US/obsidian/administrator-guide/website-management/websites-and-domains/domains-and-dns/adding-domain-aliases.65286/
